Universal drill-grinder



E. T. GORHAM, 0500. GRAND RAPIDS TRUST COMPANY, EXECUTUR.

UNIVERSAL DRILL GRINDER. APPLICATION FILED Amzz. 1919.

Patnted Jan. 4, 1921.

2 SHEETS-SHEET l.

Uforneyg E.- T.- GORHAM, DECD.

GRAND RAPlDS TRUST COMPANY, EXECUIOR.

UNIVERSAL DRILL GRINDER.

APPLICATION FILED APR. 22, 1919.

' Patentd Jan. 4, 1921.

2 SH EETS-SHEET 2.

UNITED STATES PATENT OFFICE.

EDWIN T. GORI-IAM, DECEASED, LATE or GRAND RAPIDS, MICHIGAN, BY GEAND RAPIDS rnnsrr COMPANY, nxncuron, 0E GRAND nerrns, MICHIGAN, AS- SIGNOR 'ro wrmvmarn & MORMAN COMPANY, OF GRAND RAPIDS, MICHIGAN,

A CORPORATION OF MICHIGAN.

UNIVERSAL DRILL-GRINDER.

Application filed April 22, 1919.

To all whom it may concern:

Be it known that EDWIN T. GoRHAM, deceased, late a citizen of the United States, and aresident of the city of Grand Rapids, in the county of Kent and State of Michigan, invented a certain new and Improved Universal Drill-Grinder, of which the following is a specification.

This invention relates to a drill grinder, and its primary object and purpose is to produce a grinder in which drills of all types may be ground, the grinder being provided with novel constructions and arrangements of parts whereby drills of different lengths, diameters, and angles may be ground on the one machine.

For an understanding of the invention, reference may be had to the accompanying drawings illustrating a preferred and practical form of construction, in which draw-' ings,

Figure 1 is a front elevation of the upper part of a drill grinder of my invention.

Fig. 2 is a side view thereof.

Fig. 3 is a partial plan view showing the relation of the drill to the grinding wheel and the manner in which it is brought into I operative position with respect thereto, and

Fig. 4 is a view similar to Fig. 3, the drill holder itself being shown in section and located so as to grind the drill at a different angle.

Like reference characters refer to like parts in the different views of the drawing.

In construction, a column like support 1 is provided, the upper end only of which is shown in Figs. 1 and 2, on which a shaft 2 is rotatably mounted, a grinding wheel 3 being fixed at one end of the shaft. Between its ends a pulley 4 is secured to the shaft whereby the shaft may be driven by a belt around the pulley in the usual manner.

'At a point below the upper end of the support, a bracket 5 is fixed on the end of which a sleeve 6 is carried and mounted to turn about a vertical axis. A channel like guide 7 is formed integral with the sleeve 6 and located horizontally at one side thereof in which a slide 8 is slidably mounted, this slide having an arm formed integrally therewith and extending upwardly at an angle as shown. The slide is adjustable lengthwise of the guide 7, a screw 10 thread Specification of Letters latent.

Patented Jan. 4, 1921.

Serial No. 291,960.

ing through the lower end of arm 9 and having rotatable connection to a lip 11 at one end of the guide '7, through which lip it passes, being equipped with an operating handle 12 whereby it may be rotated to effect the adjustment of the slide as is evident.

The upper end of the arm 9 carries a sleeve 13 horizontally located in which a member 14 is slidably mounted, being adjustable in the sleeve through operation of the crank 15. At the end of member 14 nearest the grinding wheel a bar 16 is located, it being of practically the same form as the slide 8,,and received in a channel like guide at one end of an arm 18 cast integral with a cylindrical member 18 in which the drill holder is mounted. The adjustment of the guide on the bar 16 is the same as that before described relative to the guide and slide 7 and 8, an operating knob 17 being used to rotate the screw. This adjustment is not shown in detail itbeing the same as the screw 10 in all essential respects, and a showing of the one is sufficient for both. A weight 19 is adjustably mounted on a depending rod 20 which is connected to the arm 18 and this weight may be adjusted to balance the different weights of drills placed in the drill holder.

\Vithin the cylindrical member 18 a cylindrical block 21 is mounted to rotate and carries two opposed chuck jaws 21 which may be moved toward or away from each other by operating a screw having a squared head 22, as shown in Fig. 3 so that a drill 23 placed between the jaws may be held firmly between the same as long as desired, and released whenever the grinding operation thereon is completed. The chuck holding the drill may be rotated about the longitudinal axis of the drill by turning the crank 22, thereby turning the end of the drill to different positions. Different types of holders for drills may be used such as shown in Fig, 4, for instance, where the holder 24: is constructed to receive a countersink drill and is rotated by operating the knurled projection 24?. Any of these different drill holding devices comprising the cylindrical member 18, immediate drill holding mechanism mounted therein, and arm 18 may be connected one at a time to the bar 16, a ready replacement of one by another being quickly accomplished.

From the foregoing, it is apparent that a drill grinding machine adapted to grind all types of drills irrespective of diameter, length or angle is provided. There is the adjustment of the drill holder toward or away from the periphery of the grinding wheel provided by the slide 8 in the guide 7 There is the pivotal adjustment due to the rotative movement possible of the sleeve 6 about a vertical axis. The chuck jaws may hold drills of different diameters and lengths, and there is a vertical adjustment of the drill holder through the adjustable connection of the arm 18 to the vertical bar 16. This collection of adjustments in combination in the one machine makes a drill grinder which is universal in all respects and does away with the necessity of providing different grinders for different types of drills, particularly drills ground at different angles.

Having fully described the invention what is claimed as new is:

1. In combination, a support, a grinding wheel mounted for rotation on the support, a bracket connected to the support and projecting to one side of the support under the grinding Wheel, a sleeve rotatably mounted on the bracket to turn about avertical axis, a horizontal guide on the sleeve, a slide adjustably mounted in the guide, means to adjust the slide to different positions, an arm extending upwardly at an angle from the slide, a sleeve at the upper end of the arm, a member mounted in the sleeve, means for adjusting said member back and forth in the sleeve toward or away from the grinding wheel, a bar positioned vertically at the end of the member nearest the grinding wheel, a drill holder including a cylindrical member and an arm projecting therefrom, said arm having a guide at its end in which the vertical bar is located, means for adjusting the drill holder vertically with respect to the bar, and drill holding devices rotatably mounted within the cylindrical member of the drill holder, substantially as described.

2. In combination, a support, a shaft rotatably mounted at the upper end of the support, a grinding wheel fixed at one end of the shaft, a slide, means carrying the slide whereby the same may be adjusted horizontally in a direction normal to the axis of the shaft, a drill holder including means for detachably holding a drill, a member on which said drill holder is carried and mounted for adjustment vertically, a supporting member on which said first member is adjustably mounted for adjustment in a direction parallel to the axis of the shaft, an arm carrying said supporting member at its upper end, the lower end of the arm being carried by the slide, and means for mounting the arm so that the same may be turned about a vertical axis, substantially as described.

3. In combination, a supporting column,a shaft rotatably mounted at the upper end thereof, a grinding wheel fixed at one end of the shaft, an arm located at an angle to the vertical and horizontal, means connecting the lower end of the arm to the supporting column, adjusting means included in said first mentioned means whereby the arm may be turned about a vertical axis or moved bodily in a direction perpendicular to the axis of said shaft, a member movably mounted at the upper end of the arm, means for moving said member in a direction parallel to the axis of the shaft, a drill holder connected to the end of the member nearest the grinding wheel, said drill holder bein located at one side of the grinding whee, and means in the drill holder for releasably holding drills of different diameters, substantially as described.

GRAND RAPIDS TRUST COMPANY, [L. s.] Executor of estate of Edwin T. Gorham, deceased.

By HUGH E. WILSON,

Secretary. 

